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Old 22nd December 2013, 11:09 PM   #651
6L6 is offline 6L6  United States
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Input Ground.

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Old 23rd December 2013, 01:11 AM   #652
roger57 is offline roger57  Canada
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Quote:
Originally Posted by 6L6 View Post
Input Ground.

Click the image to open in full size.
That picture leaves no doubt

Thanks!
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Old 23rd December 2013, 01:38 AM   #653
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For single end input, ground the in- either at the board ( see the 6L6 build thread) or at the XLR plug itself.
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Old 23rd December 2013, 01:45 AM   #654
roger57 is offline roger57  Canada
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Originally Posted by Bones13 View Post
For single end input, ground the in- either at the board ( see the 6L6 build thread) or at the XLR plug itself.
Thanks for the info.
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Old 23rd December 2013, 12:00 PM   #655
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Heh, I guess I put the iPad down while I was reading/answering the question, Jim's pictures were not up when I started the anemic answer I gave. I am mounting both RCA and balanced XLR jacks on my current build. I'm putting a switch near each pair of inputs to short the in- to ground between and to the side of the jacks. I intend to turn the switch so that when you flip the switch, it will point at the correct jack.
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Old 23rd December 2013, 02:05 PM   #656
roger57 is offline roger57  Canada
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Quote:
Originally Posted by Bones13 View Post
Heh, I guess I put the iPad down while I was reading/answering the question, Jim's pictures were not up when I started the anemic answer I gave. I am mounting both RCA and balanced XLR jacks on my current build. I'm putting a switch near each pair of inputs to short the in- to ground between and to the side of the jacks. I intend to turn the switch so that when you flip the switch, it will point at the correct jack.
That's an interesting and good idea.
I'm developing a PIC/uController PCB for mine that will control power-on surge, mute signals & temperature sensing. At the minimum the temperature sensing will output a signal to drive an LED for "Thermal" or Overtemperature" and could optionally shut power at relay. It will also control any shutdown surge (i.e., discharging power caps)
Optionally, fan control - don't need to use it if you don't want but will have the control signal for variable speed according to sensed heatsink temperature. That would be for those of you that want more bias with not quite enough heatsink

It will be small enough fit easily in the chassis and will not have anything in the signal path not cause any spurious noise.

Timeframe? I'd like to be done soon but I need to prototype on my bench build AlephJ before issuing any schematics (Just ordered the amp PCB's) and will put all the particulars here. I can develop in parallel in any case. If there's interest from users about getting a board, I'll have to understand how that works from DIYA or another user that's done this before about a "group buy".

I may ask some questions about the build as I go along but I see many of you (notably 6L6) have done a great job to document and provide ideas.

Gary

Last edited by roger57; 23rd December 2013 at 02:18 PM.
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Old 23rd December 2013, 03:04 PM   #657
6L6 is offline 6L6  United States
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Regarding circuit boards, what's normally done is you buy a small run, say 10 or 20, and sell them on group buy or similar. You have the chance to recoup the costs and make a few bucks for the next one.
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Old 23rd December 2013, 04:20 PM   #658
roger57 is offline roger57  Canada
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Regarding circuit boards, what's normally done is you buy a small run, say 10 or 20, and sell them on group buy or similar. You have the chance to recoup the costs and make a few bucks for the next one.
OK, thanks. When the development gets to that point, perhaps I can PM you fro a discussion on how to go from there.

If anyone has anything on their wish list for this project, please post it and I'll see how it can be fit in. I think the idea for XLR selection by Bones13 is a good one. Will figure out if and how this could be done through the controller circuit. Likely a soft-switch on the front. As many don't want or plan to use XLR, it might be still nice to have the inputs and have the option one day to use it.
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Old 23rd December 2013, 06:33 PM   #659
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I am using this board for my switch circuit

The ε24 Power Switch Driver Circuit

It has capability for 2 thermistor cut offs, and can change the switch LED color with temp controlled shutdown.

I also am using a DIYAudio store soft start circuit after the relay controlled by the switch circuit.
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Old 23rd December 2013, 06:45 PM   #660
roger57 is offline roger57  Canada
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Quote:
Originally Posted by Bones13 View Post
I am using this board for my switch circuit

The ε24 Power Switch Driver Circuit

It has capability for 2 thermistor cut offs, and can change the switch LED color with temp controlled shutdown.

I also am using a DIYAudio store soft start circuit after the relay controlled by the switch circuit.
Nice! One doesn't have to reinvent the wheel, so to speak.
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